Apparatus

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sensors Mode-S transponder

7817AB

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-20DH · BOEING 737 MAX 8

Hex
7817AB
Octal
36013653
Decimal
7,870,379
Country
CN
Tail
B-20DH
Type
B38M
No current signal · last broadcast Jul 26, 16:05 UTC
Flights observed
197
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 16:05 UTC

Last known position

Most recent position reported by Mode-S 7817AB.

Country allocation

The ICAO 24-bit address 7817AB falls within the block assigned to China (CN) by ICAO Annex 10, Volume III. Every aircraft registered in China receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 20 distinct

Callsign Airline Flights Last seen
CCA979 - 10 2026-07-06
CCA117 - 10 2026-07-08
CCA980 - 9 2026-07-06
CCA960 Air China 9 2026-07-21
CCA959 Air China 8 2026-07-21
CCA118 - 8 2026-07-09
CCA1215 Air China 6 2026-07-21
CCA702 - 5 2026-07-11
CCA1241 - 5 2026-07-10
CCA1216 - 5 2026-06-30
CCA701 - 4 2026-07-11
CCA556 Air China 4 2026-07-24
CCA1349 Air China 4 2026-07-22
CCA1242 - 4 2026-07-11
CCA9613 - 3 2026-07-19
CCA902 - 3 2026-07-07
CCA901 - 3 2026-07-07
CCA555 Air China 3 2026-07-24
CCA4015 Air China 3 2026-05-26
CCA1601 - 3 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CCA1246 HTN → PEK Jul 26, 15:45 UTCJul 26, 16:05 UTC20m
2026-07-26 CCA1245 PEK → HTN Jul 26, 05:10 UTCJul 26, 05:35 UTC25m
2026-07-25 CCA1361 PEK → HAK Jul 25, 00:50 UTCJul 25, 06:00 UTC5h 10m
2026-07-24 CCA556 BKK → PEK Jul 24, 08:10 UTCJul 24, 12:30 UTC4h 20m
2026-07-24 CCA555 PEK → BKK Jul 24, 01:25 UTCJul 24, 06:00 UTC4h 35m
2026-07-23 CCA9666 SZX → HGH Jul 23, 15:30 UTCJul 23, 15:50 UTC20m
2026-07-23 CCA9665 HGH → SZX Jul 23, 04:30 UTCJul 23, 04:40 UTC10m
2026-07-22 CCA1349 PEK → CSX Jul 22, 13:05 UTCJul 22, 13:30 UTC25m
2026-07-21 CCA1215 PEK → KHG Jul 21, 23:00 UTCJul 21, 23:10 UTC10m
2026-07-21 CCA960 BKK → PEK Jul 21, 12:55 UTCJul 21, 14:40 UTC1h 45m
2026-07-21 CCA959 PEK → BKK Jul 21, 06:25 UTCJul 21, 11:00 UTC4h 35m
2026-07-21 CCA1813 PEK → HFE Jul 21, 00:15 UTCJul 21, 00:25 UTC10m
2026-07-20 CCA1439 PEK → CKG Jul 20, 06:20 UTCJul 20, 13:20 UTC7h 0m
2026-07-19 CCA9613 - Jul 19, 23:00 UTCJul 19, 23:25 UTC25m
2026-07-19 CCA1245 - Jul 19, 05:10 UTCJul 19, 05:25 UTC15m
2026-07-19 CCA4137 CKG → PEK Jul 19, 03:00 UTCJul 19, 03:15 UTC15m
2026-07-18 CCA4136 - Jul 18, 13:00 UTCJul 18, 13:20 UTC20m
2026-07-18 CCA1446 KMG → PEK Jul 18, 03:05 UTCJul 18, 11:00 UTC7h 55m
2026-07-17 CCA9741 - Jul 17, 14:30 UTCJul 17, 14:50 UTC20m
2026-07-17 CCA556 - Jul 17, 12:30 UTCJul 17, 12:40 UTC10m
2026-07-17 CCA556 - Jul 17, 09:30 UTCJul 17, 09:45 UTC15m
2026-07-17 CCA556 - Jul 17, 08:10 UTCJul 17, 08:30 UTC20m
2026-07-17 CCA555 - Jul 17, 05:55 UTCJul 17, 06:20 UTC25m
2026-07-17 CCA555 - Jul 17, 01:45 UTCJul 17, 04:54 UTC3h 10m
2026-07-16 CCA9666 - Jul 16, 15:30 UTCJul 16, 15:49 UTC20m
2026-07-16 CCA9665 - Jul 16, 04:35 UTCJul 16, 04:50 UTC15m
2026-07-15 CCA1601 - Jul 15, 13:25 UTCJul 15, 13:35 UTC10m
2026-07-14 CCA9606 - Jul 14, 13:05 UTCJul 14, 13:25 UTC20m
2026-07-14 CCA9605 - Jul 14, 04:55 UTCJul 14, 05:05 UTC10m
2026-07-13 CCA9614 - Jul 13, 03:50 UTCJul 13, 04:10 UTC20m
2026-07-12 CCA9613 - Jul 12, 23:05 UTCJul 12, 23:30 UTC25m
2026-07-12 CCA1246 - Jul 12, 15:35 UTCJul 12, 15:55 UTC20m
2026-07-12 - - Jul 12, 05:35 UTCJul 12, 05:55 UTC20m
2026-07-12 CCA1545 - Jul 12, 01:00 UTCJul 12, 01:10 UTC10m
2026-07-11 CCA702 - Jul 11, 22:40 UTCJul 11, 22:55 UTC15m
2026-07-11 CCA702 - Jul 11, 18:30 UTCJul 11, 19:40 UTC1h 10m
2026-07-11 CCA701 - Jul 11, 12:30 UTCJul 11, 16:55 UTC4h 25m
2026-07-11 CCA1242 - Jul 11, 06:50 UTCJul 11, 07:10 UTC20m
2026-07-10 CCA1241 - Jul 10, 22:40 UTCJul 10, 23:05 UTC25m
2026-07-10 CCA1250 - Jul 10, 17:00 UTCJul 10, 17:10 UTC10m
2026-07-10 CCA1249 - Jul 10, 06:20 UTCJul 10, 06:35 UTC15m
2026-07-09 CCA9613 - Jul 9, 23:10 UTCJul 9, 23:30 UTC20m
2026-07-09 CCA702 - Jul 9, 16:25 UTCJul 9, 17:40 UTC1h 15m
2026-07-09 CCA701 - Jul 9, 10:20 UTCJul 9, 14:40 UTC4h 20m
2026-07-09 CCA118 - Jul 9, 03:35 UTCJul 9, 03:45 UTC10m
2026-07-09 CCA118 - Jul 9, 00:55 UTCJul 9, 01:10 UTC15m
2026-07-08 CCA117 - Jul 8, 10:05 UTCJul 8, 13:00 UTC2h 55m
2026-07-07 CCA1242 - Jul 7, 21:00 UTCJul 7, 21:15 UTC15m
2026-07-07 CCA1241 - Jul 7, 13:15 UTCJul 7, 13:35 UTC20m
2026-07-07 CCA902 - Jul 7, 05:50 UTCJul 7, 06:10 UTC20m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the B-20DH page for operator, model, and routing details .

Mode-S 7817AB frequently asked

What is Mode-S code 7817AB?
7817AB is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-20DH.
Where is Mode-S 7817AB registered?
Mode-S code 7817AB is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7817AB broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 16:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7817AB, octal 36013653, decimal 7,870,379.
What flights does 7817AB operate?
Mode-S 7817AB has broadcast 20 distinct callsigns, including CCA979, CCA117, CCA980, CCA960, CCA959.